Blood Transfusions and Transfusion Reactions: NCLEX Study Guide

Blood transfusions are a high-yield NCLEX topic because errors can be rapidly fatal. This guide covers the major blood products, compatibility rules, pre-transfusion nursing responsibilities, and the recognition and immediate management of transfusion reactions.

Blood Products at a Glance

• Packed Red Blood Cells (PRBCs) — symptomatic anemia (Hgb <7 g/dL) or hemorrhage. Most commonly transfused product; infuse over 2–4 hours.
• Platelets — thrombocytopenia (platelets <10,000–20,000). Stored at room temperature with continuous agitation; no microaggregate filter.
• Fresh Frozen Plasma (FFP) — coagulation factor deficiencies, DIC. Contains all clotting factors; must be ABO compatible.
• Cryoprecipitate — fibrinogen deficiency, DIC. Contains fibrinogen, factor VIII, and von Willebrand factor.
• Albumin — hypovolemic shock, hypoalbuminemia. No infectious risk; does not require blood typing.

Blood Compatibility

• Type O negative is the universal RBC donor — used in emergencies before crossmatching is complete.
• Type AB positive is the universal RBC recipient — can receive from any type.
• Rh-negative patients must receive only Rh-negative blood; Rh-positive patients can receive either.

Critical Transfusion Timing Rules

• Blood must be started within 30 minutes of leaving the blood bank.
• Transfusion must be completed within 4 hours of leaving the blood bank.
• These limits prevent bacterial growth in the product.
• If transfusion cannot start within 30 minutes, return the blood to the blood bank.

Pre-Transfusion Nursing Actions

• Verify the provider's order and obtain informed consent.
• Obtain baseline vital signs (temperature, HR, BP, RR).
• Verify patient identity using two identifiers, and check the blood product against the order with another licensed professional.
• Prime tubing with normal saline only — dextrose causes hemolysis and lactated Ringer's can cause clotting.
• Use a dedicated IV line with a 20-gauge or larger needle and a Y-type blood administration set with in-line filter.
• Stay with the patient for the first 15 minutes — most severe reactions occur in this window.
• Monitor vital signs every 15 minutes for the first hour, then hourly per protocol.
• Start infusion slowly at about 2 mL/min for the first 15 minutes.

Transfusion Reactions

Acute Hemolytic

• Cause: ABO or Rh incompatibility.
• Signs: fever, chills, back pain, hypotension, dark urine.
• Action: STOP immediately; maintain IV line with new tubing and saline; notify provider and blood bank; send blood and urine samples.

Febrile Non-Hemolytic

• Cause: recipient antibodies against donor WBCs.
• Signs: fever, chills, headache within 1–6 hours.
• Action: stop transfusion; give antipyretics.

Allergic

• Cause: antibodies against plasma proteins.
• Signs: urticaria, itching, flushing, wheezing.
• Action: mild — slow infusion and give antihistamines; severe — stop.

Anaphylactic

• Cause: IgA deficiency in recipient.
• Signs: hypotension, bronchospasm, stridor.
• Action: STOP immediately; epinephrine, antihistamines, corticosteroids.

Bacterial Contamination

• Cause: contaminated blood product.
• Signs: high fever, rigors, hypotension.
• Action: STOP immediately; blood cultures, antibiotics.

Circulatory Overload (TACO)

• Cause: rapid or large-volume infusion.
• Signs: dyspnea, crackles, hypertension, JVD.
• Action: slow infusion; sit patient upright; give diuretics.

TRALI (Transfusion-Related Acute Lung Injury)

• Cause: donor antibodies activate recipient neutrophils.
• Signs: acute respiratory distress, hypoxia, fever within 6 hours (typically without hypertension).
• Action: STOP transfusion; oxygen and respiratory support.

Immediate Actions for Any Reaction

• Stop the transfusion immediately at the first sign of a reaction.
• Keep the IV line open with normal saline using new tubing.
• Notify the provider and blood bank immediately.
• Recheck patient ID and blood product labels.
• Monitor vital signs every 5 minutes until stable.
• Collect blood and urine samples as ordered.
• Return the blood bag and tubing to the blood bank.
• Document the reaction thoroughly.

Massive Transfusion Protocol

• Defined as replacement of one blood volume in 24 hours or >10 units of PRBCs.
• Use a 1:1:1 ratio of PRBCs, FFP, and platelets to prevent dilutional coagulopathy.
• Use blood warmers to prevent hypothermia.
• Monitor for hyperkalemia (stored blood) and hypocalcemia (citrate toxicity).

Blood Product Storage

• PRBCs: 1–6 °C in monitored refrigerators.
• Platelets: room temperature (20–24 °C) with continuous gentle agitation — never refrigerated.
• FFP: thaw at 30–37 °C; use within 24 hours.
• All products except platelets require a filter during administration.

Special Considerations

• Leukocyte-reduced products: patients with prior febrile reactions or chronic transfusions.
• Irradiated products: immunocompromised patients at risk for graft-versus-host disease.
• CMV-negative products: immunocompromised CMV-negative recipients.
• Chronic transfusion patients risk iron overload, requiring chelation with deferoxamine.

Nursing Assessment During Transfusion

• Assess baseline vital signs before starting.
• Monitor for fever, chills, rash, dyspnea, chest pain, back pain, dark urine.
• Auscultate lung sounds — crackles suggest fluid overload.
• Monitor urine output and color — dark urine suggests hemolysis.

Patient Teaching

• Report any unusual sensations: chills, itching, chest or back pain, or difficulty breathing.
• Notify the nurse immediately for any discomfort or unusual symptoms.

Common Exam Traps

• Only normal saline is compatible with blood — never dextrose or LR.
• Start within 30 minutes, complete within 4 hours.
• The first 15 minutes are most critical.
• TACO: hypertension + crackles. TRALI: hypoxia without hypertension.
• Acute hemolytic = ABO incompatibility → hypotension, dark urine, back pain.
• Platelets are never refrigerated.
• O negative = universal donor; AB = universal recipient.
• IgA deficiency → risk of anaphylactic reaction.

Key Takeaways

• Use normal saline only, a 20-gauge or larger IV, and a Y-type filtered set; verify blood with a second licensed professional using two identifiers.
• Start within 30 minutes, complete within 4 hours, and stay with the patient for the first 15 minutes.
• At the first sign of reaction: stop the transfusion, keep the line open with NS via new tubing, and notify the provider and blood bank.
• Acute hemolytic (ABO incompatibility) is the most dangerous reaction — recognize back pain, hypotension, and dark urine.
• Distinguish TACO (hypertension, crackles, fluid overload) from TRALI (hypoxia, respiratory distress, no hypertension).
• O negative is the universal RBC donor; AB positive is the universal recipient; IgA-deficient patients are at risk for anaphylaxis.